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node_modules/is-bigint/test/index.js

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+'use strict';
+
+var test = require('tape');
+var inspect = require('object-inspect');
+var hasBigInts = require('has-bigints')();
+var hasSymbols = require('has-symbols')();
+var hasToStringTag = require('has-tostringtag/shams')();
+
+var isBigInt = require('../');
+
+var debug = function (v, m) { return inspect(v) + ' ' + m; };
+
+var forEach = function (arr, func) {
+	var i;
+	for (i = 0; i < arr.length; ++i) {
+		func(arr[i], i, arr);
+	}
+};
+
+test('non-BigInt values', function (t) {
+	var nonBigInts = [
+		true,
+		false,
+		Object(true),
+		Object(false),
+		null,
+		undefined,
+		{},
+		[],
+		/a/g,
+		'string',
+		42,
+		new Date(),
+		function () {},
+		NaN
+	];
+	if (hasSymbols) {
+		nonBigInts.push(Symbol.iterator, Symbol('foo'));
+	}
+	t.plan(nonBigInts.length);
+	forEach(nonBigInts, function (nonBigInt) {
+		t.equal(false, isBigInt(nonBigInt), debug(nonBigInt, 'is not a BigInt'));
+	});
+	t.end();
+});
+
+test('faked BigInt values', function (t) {
+	t.test('real BigInt valueOf', { skip: !hasBigInts }, function (st) {
+		var fakeBigInt = { valueOf: function () { return BigInt(42); } };
+		st.equal(false, isBigInt(fakeBigInt), 'object with valueOf returning a BigInt is not a BigInt');
+		st.end();
+	});
+
+	t.test('faked @@toStringTag', { skip: !hasBigInts || !hasToStringTag }, function (st) {
+		var fakeBigInt = { valueOf: function () { return BigInt(42); } };
+		fakeBigInt[Symbol.toStringTag] = 'BigInt';
+		st.equal(false, isBigInt(fakeBigInt), 'object with fake BigInt @@toStringTag and valueOf returning a BigInt is not a BigInt');
+
+		var notSoFakeBigInt = { valueOf: function () { return 42; } };
+		notSoFakeBigInt[Symbol.toStringTag] = 'BigInt';
+		st.equal(false, isBigInt(notSoFakeBigInt), 'object with fake BigInt @@toStringTag and valueOf not returning a BigInt is not a BigInt');
+		st.end();
+	});
+
+	var fakeBigIntString = { toString: function () { return '42n'; } };
+	t.equal(false, isBigInt(fakeBigIntString), 'object with toString returning 42n is not a BigInt');
+
+	t.end();
+});
+
+test('BigInt support', { skip: !hasBigInts }, function (t) {
+	forEach([
+		Function('return 42n')(), // eslint-disable-line no-new-func
+		BigInt(42),
+		Object(BigInt(42))
+	], function (bigInt) {
+		t.equal(true, isBigInt(bigInt), debug(bigInt, 'is a BigInt'));
+	});
+
+	t.end();
+});